Filter.



H. ALINDER.

FILTER.

APPLICATION FILED IBB. 15, 1911.

1,084,388, Patented Jan. 13, 1914.

WITNEEEES- ATTCIRNEY- coLuMBlA PLANOGRAPH co.,WAsHINuTON. D. C.

'llhflfTEft fffldllld@ AENT @FEIS HENRY ALINDEB, 0F MILWAUKEE,WISCONSIN, ASSIGNOR, BY MESNE ASSIGNMENTS,

T() ALLISCHALIVIERS MANUFACTURING- CDMPANY, A CC'RPORA'I'ION 0F DELA-WARE.

FLTER.

inattesa.

Application filed February 15, 1911.

To all whom t may concern:

Be it known that l, HENRY ALINDER, a subject of the King of Sweden,residing at Milwaukee, in the county of Milwaukee and State oflWisconsin, have invented a certain new and useful improvement inFilters, of which the following is a specification.

rlhis invention relates to improvements in the construction ofcontinuous rotary filters for use in the treatment of metallurgicalslimes or similar substances.

The object of the invention is to provide a continuous rotary filterwhich .is simple in construction and which has the maximum capacity forminimum amount of space occupied.

ln the treatment of metallurgical slimes it is essential to provide ameans for successively treating and filtering the slimes until all ofthe values have been extracted therefrom.

lt is an object of this invention to provide a simple means for thussuccessively filtering the slimes.

A clear conception of one embodiment of the invention can be obtained byreferring to the accompanying drawing in whichV like referencecharacters designate the same or similar parts in the various views.

Figure l is a transverse, central Vertical section through a filterhaving two filtering drums. Fig. 2 is a section through the shaft of thefilter showing the solution outlets therefrom, the section being takenon the line ll-ll of the filter shown in Fig. l looking in the directionof the arrow. Fig. 3 is an end view partly in section, of one of thedrums of the filter shown in Fig. l, the section being taken along theline lll-lll looking in the direction of the arrow. F ig. i

is a section through the shaft of the filter, showing the dischargeports and stationary discharge casing, the section being taken on theline fl-lfl of the filter shown in Fig. l looking toward the left.

Each of the' filter drums consists essentially of two circular frames 4tmounted upon central hubs 30, 31, the frames 4lbeing supported from thehubs by means of series of radial arms. The hubs 80, 3l, are fixed tothe main filter shaft 8 in any suitable manner, as by shrinking orkeying. rlChe frames l are spaced from each other by means of radiallyprojecting ribs 50 which are formed integral with the hubs 30, 31,

Specicaton of Letters Patent.

Patented J an. 13, i914.

Serial No. 608,659.

and project some distance beyond the peripheries of the frames fl asclearly shown in Fig. 3.

'lhe pocket filter cells 2 are wedge shaped and have sheet metal frames35 which closely fit the radially projecting ribs of the hubs 30, 31.The outer ends of the cells 2 are open thereby producing an openperiphery for the filter drum; that is, the cells 2 are outwardly openfor inlet of slime to the interior thereof. rllhe sheet metal frames 35of the pocket cells 2 are lined with a filler 2G which may be eithercocoa matting, corrugated wood, or other suitable material. T ie filler26 is lined with a filtering medium 25, such as canvas, the filteringmedium being supported by the filler which howover, permits thewithdrawal of liquid through the filtering medium 25. The lowerextremities of the cells 2 are provided with liquid receiving chambers5, these chambers being formed intermediate the ends of the frame andthe perforated supporting screens G which support the filler 26 andprevent same from filling the chambers 5. lischarge openings 3 areformed at the inner ends of the pocket lter cells 2 and are directedlongitudinally of the supporting shaft 8 of the hubs 30, 31; that is,the cells 2 are inwardly open for cake discharge. 'lhe discharge spouts,having the openings 3 formed thereon, terminate in a plane substantiallycoincident with the plane of the inner wall of the tank into which thedrum extends. The cells 2 are so formed that they can be easily removedfrom the filter frames by lifting them away from the shaft unt-il thedischarge spouts come in contact with the frame 4t and swinging the cellthus positioned through an angle cf 90 degrees after which withdrawalthereof is unobstructed.

rThe main filter shaft 8 is mounted in suitable bearings above a liquidcontaining receptacle or tank. This receptacle or tank is shown ascomposed of three compartments QQ, Q3, 2li. Such construction ishowever, not essential since as many compartments and filter drums asdesired may be used. rlhe over-hanging end of the shaft 8 adjacent theshaft .supporting bearing 9, is provided with a suitable driving pulleyl0 which derives its power from any suitable source, not shown.

The interior of the shaft 8 is provided with passages 21 of anumber'equal to the number of cells on the second filtering drum. Thepassages 21 connect with the chambers 5 of the pocket filtering cells 2and emerge from the shaft 8 at their opposite ends through anenlargement or flange. Pipes 7 connect the chambers 5 of the first lterdrum with the enlargement or flange of the shaft 8 and emerge from t-hisflange at the same plane from which the passages 21 emerge. Packingdevices 14.- may be used at this plane of coacting surfaces. Thereceiving casing 1G is provided with conduits 20, 15, which are adaptedto be brought in connection with the pipes 7 leading from the firstdrum, see Fig. et. Similar conduits 13, 19, are formed in the receivingcasing 16 and are adapted to connect With the passages 2l. The lowerconduits 15, 19, connect with vacuum pipes 1S, 17, respectively, theseconduits therefore being known as the vacuum conduits. The conduits 15,19, are of such length that the chambers 5 of the cells 2 will beconnected with the vacuum during their entire passage through the liquidcontained in the liquid receptacles. The upper conduits 13, 20, connectwith fluid pressure pipes 12, 11, respectively, and are therefore knownas the pressure conduits. The conduits 13, 20, are of such length thatthe pipes 7, 21, are in connection therewith during the passage of thefilter cells through the space above the liquid in the receptacles 22,23.

Spray nozzles 1, 101, are located above the first and second filteringdrums respectively and are so placed that wash water for the cells 2 canbe admitted at the desired time. The spray nozzles 1, 101, may be undercontrol of valves if so desired, such construction being omitted fromthe disclosure since it forms no part of the present invention.

During the operation of the filter the slime or material to be ltered isadmitted to the first or strong solution chamber 22. As the successivecells 2 of the first filter drum enter the liquid in the chamber 22,said immersion being the result of slow rotation imparted to the shaft8, their corresponding chambers 5 are brought in connection with thevacuum conduit through the pipe 7. This submerging of the cells 2 andsimultaneous placing of the same under vacuum causes liquid to be drawnthrough the filtering medium 25, filler 26, to the chamber 5 from whenceit is discharged through the pipe 7, chamber 15 and pipe 18.

As the detachable pocket filter cells 2 leave the liquid in the chamber22, the pipe 7 corresponding to the emerging cell is brought inconnection with the high pressure conduit 20 in which air or similarfluid under pressure is maintained. This high pressure air flows throughthe pipe 7, chambers 5, and acts against the inner side of the filtermedium 25, thus tending to dislodge the cake which has been formed onthe cell 2 during the previous filtering operation. As the cells 2advance with the rotation of the drum, the wash water is admittedthrough the nozzles 1 dislodging the cake and washing same through thedischarge outlet 3 into the next succeeding liquid chamber 23. Thisdischarge of the material into the chamber 23 is accomplished by thedischarge spouts which are located very near the separating wall betweenthe chambers 22, 23, and are directed toward the chamber 23.

As the detachable pocket lter cells 2 of the second filter drum enterthe liquid in the weak solution chamber 23, their chambers 5 are broughtin connection with the weak solution vacuum chamber 19 through thepassages 21 formed in the shaft 8 and connecting with the chambers 5.The weak solution chamber 19 is kept under vacuum, the substancesgathering therein being discharged through the pipe 17. The cells 2 arekept under vacuum until they leave the liquid in the weak solutionchamber 23, filtration of the liquid taking place during the time thatthe cells are submerged and a thin cake of solid matter again collectingon the surface of the filtering medium 25. As the cells leave the liquidin the second chamber 23, their corresponding passages 21 aresuccessively brought in connection with the pressure chamber 13. Thiscauses pressure to be admitted on the inner side of the ltering medium25 in opposition to the cake formed on the outer surface thereof, theresult being that the cake is loosened as in the first filteringoperation. Upon reaching a predetermined point in the revolution of thedrum, the interior of the cells 2 of the second drum are subjected tothe action of sprays from the nozzles 101. This washing or sprayingremoves the loosened cake from the filtering medium 25 and dischargessame as a thickened liquid to the discharge chamber 24. The materialthus discharged can be either continuously or intermittently dischargedfrom the chamber 24e by any suitable means such as a conveyer, or it maybe re-treated in a third ltering drum to produce a second Weak solution.

It will be noted that with the construction of detachable filter cells 2as disclosed, a large filtering area is obtained. This is an essentialfeature since the amount of ltration depends largely upon the area ofthe filtering surface exposed to the liquid. The filter is moreovercontinuous and automatic in its action since the handling of thematerials is entirely mechanical after same has been admitted to thefilter. The formation of independent detachable cells 2 provides a meanswhereby a portion of the filtering medium alone need be replaced therebyavoiding replacement of the entire medium in oase only a small partbecomes ineffective or worn.

It should be understood that it is not desired to be limited to theexact details of construction shown and described, for obviousmodifications will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent,-

1. In a filter, a tank, a shaft extending over said tank, a frame onsaid shaft extending into said tank, and an outwardly open detachablepocket filter cell supported in said frame and having a discharge spoutterminating in a plane substantially coincident with the plane of theinner surface of a wall of said tank.

2. In a filter, a shaft, a frame mounted on said shaft, and a pluralityof wedge shaped filter cells radially support-ed in said frame, saidcells having inlet openings for slime at points remote from said shaftand having discharge openings for cake at points adjacent said shaft.

3. In a filter, a shaft, a frame on said shaft, and a plurality ofdetachable pocket filter cells outwardly open for slime inlet andinwardly open for cake discharge, radially supported in said frame.

4. In a filter, a tank, a rotatable shaft over said tank, a plurality offilter cells arranged around said shaft and forming outwardly openpockets, said pockets having discharge openings for cake at their innerends whereby the cake is discharged over the side of the tank, and pipeconnections from the interior of said cells.

In testimony whereof, I affix my signature in the presence of twowitnesses.

HENRY ALINDER.

I/Vitnesses:

CHAs. L. BYRON, W. H. LIEBER.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner o1' Patents. Washington, D. C.

